Quote Originally Posted by areias
There's also the issue of if your dog hits the end of the lead, what kind of damage can occur (whip lash, neck problems).

You have the same issue with a regular leash. I mean, Finn is pretty good on leash, now, but, if he sees a squirrel, he bolts. And, it's no easier on his neck than a retractable leash reaching it's full length.